/Engine/Plugins/FX/Niagara/Source/Niagara/Classes/NiagaraScript.h
Updates the RI parameter store based on the provided variables (missing entries will be added and stale entries will be removed. Returns true if the parameter store was modified.
bool ApplyRapidIterationParameters ( TConstArrayView< [FNiagaraVariable](API\Plugins\Niagara\FNiagaraVariable) > InParameters, bool bAllowRemoval )